Digital filters with control of limit cycles

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364745, G06F 1534, G06F 748

Patent

active

042131871

ABSTRACT:
Limit cycles are eliminated in digital filters driven by zero, d.c. and period 2 inputs, by adjusting the filter output in response to the state variables present within the filter. The filter includes a quantizer (201) adapted to provide a fixed length output word p in response to an input y, where p<y<p+k and k is the quantizer step size. The filter is further arranged to form the products a.multidot.X.sub.n and b.multidot.X.sub.n, where a and b are multiplier coefficients and X.sub.n and X.sub.n-1, the state variables, are once and twice delayed versions of the filter output X.sub.n+1, and to combine the aforesaid products and the filter input U.sub.n to yield the value y. In accordance with the invention, the quantizer output is adjusted to p+k, if

REFERENCES:
patent: 3749895 (1973-07-01), Kao
patent: 3777130 (1973-12-01), Croisier et al.
patent: 4034196 (1977-07-01), Butterweck et al.
patent: 4034197 (1977-07-01), Lawrence et al.
"A New Second-order Digital Filter . . . Oscillations", K. Meerkotter _et al., AEU, Elect. & Commun., Band 29, 1975, pp. 312-314.
"A New Hardware Realization of Digital Filters", A. Peled et al., _IEEE Trans. on A.S.S.P., Dec. 1974, pp. 456-462.
"Iterative Logical Network for Parallel Multiplication", J. C. Hoffman et al., Electronics Letters, May, 3, 1968, p. 178.
Digital Signal Processing Handbook, J. R. Mick, Advanced Micro Devices, Inc., 1976, pp. 28-40.
"Suppression of Parasitic Oscillations . . . Rounding Arithmetic", _H. Butterweck, AEU, Elect. & Commun., Band 29, 1975, pp. 371-374.
"A Novel Approach . . . Quantization Noise", M. Buttner, Proc. 1976 IEEE Intl. Symp. Circuits & Systems, pp. 291-294.
"Conrol of Limit Cycle Osc . . . Random Quantization", V. B. Lawrence et al., IEEE Trans. on A.S.S.P., Apr. 1978, pp. 127-134.
"Suppression of Parasitic Oscillations . . . Filters", A. Fettweis et al., IEEE Trans. on Circ. & Systems, Mar. 1975, pp. 239-246.

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